Deluxe Digital Non-Programmable Thermostat RTHL3550D

DIY Install
The Deluxe Digital Non-Programmable Thermostat offers easy push-button operation and premium features such as Auto Stop and precise comfort control. It’s a thermostat that’s easy to use with some nice functionality that you’ll appreciate.
Verify compatibility with your home heating and cooling system, remove your existing thermostat and follow step-by-step instructions for installation.
Easy to use. Deluxe in features.

Our Deluxe Digital Non-Programmable Thermostat is easy to use with a large, backlit digital display and push-button operation. It also has a more sophisticated side, with features such as changing from heat to cool automatically, precise comfort control and an ability to set minimum cool/maximum heat temperature settings.

  • Easy to use
  • Large backlit digital display
  • Display options — degree Celsius or Fahrenheit temperature
  • Easy-access battery replacement
  • Set point retained in memory (in the event of power outage)
  • One-year warranty
  • DIY installation
Precise Comfort Control
Within +/-1 degree F for maximum comfort
Temperature Range Limits
Set minimum cool and maximum temperature settings
Auto Change
Go from heat to cool automatically
Model/Sku #
Model number: RTHL3550D


Digital Non-Programmable Thermostat FrontView
Digital Non-Programmable Thermostat FrontView
Digital Non-Programmable Thermostat FrontView
Digital Non-Programmable Thermostat FrontView

Compatible with systems

  • This thermostat is compatible with heating and cooling systems and heat pumps.
  • It is not compatible with electric baseboard heat (120/240V).

Follow the quick installation guide that comes with the Deluxe Digital Non-Programmable Thermostat RTHL3550D. If you misplaced this guide, you can find it in the resources section below. Installation is fast and easy. Remove your old thermostat, but be sure to label the wires. Install and wire your new thermostat. Set your new thermostat to match your heating/cooling system.